Machine for making cap screw blanks



5 Sheets-Sheet l ATTORNEY Nov. 1, 1932. J. E. PRACNY MACHINE FOR MAKINGCAP SCREW BLANKS Filed June 5, 1950 H \m WW M M\W x il Nov, 1, 1932. J,E, PRAcNY 1,885,288

MACHINE FOR MAKING GAP SCREW BLANKS Filed June 5. 1930 3 Sheets-Sheet 2ATTORNEY Nov. 1, 1932. I J. E. PRACNY 1,835,288

MACHINE FOR MAKING GAP SCREW BLANKS Filed June 5, 1950 5 Sheets-Sheet 3//v VZ'N 70/2.

ATTORNEY Patented Nov. 1 1932 UNITED STATES I PATENT OFFICE JOHN E.PRACNY, OF WATERBURY, CONNECTICUT, ASSIGNOR TO THE E. J. MANVILLEMACHINE COMPANY, OF WATERBURY, CONNECTICUT, A CORPORATION OF CON-NECTICUT MACHINE FOR MAKING CAP SCREW BLANKS Application filed June 5,1930. Serial No. 459,268.-

This invention relates to mechanism which is designed to transfer stockfrom between one punch and die into line with another punch and die in ametal heading mach ne 50f the type that has two reciprocating punchesand two fixed dies arranged in the same horizontal plane.

. The object of the invention is to provide a transfer mechanism forsuch machines 10 which is relatively inexpensive to build and apply,rugged and durable, may be operated rapidly and will accurately presentthe stock in the proper positions, which mechanism is readily accessiblefor adjustment, cleanmg and repairs.

Theinvention is illustrated in connection with a header that is providedwith a punch and extruding-die designed to reduce a secadvanced throughthe quill 6 by any known feed mechanism, and a length 10 is severed bythe action of the cutter 11 which is reciprocated across the quill bythe usual cutter mechanism. The cutter blade has spring fingers 12 whichgrasp the severed piece of rod and with the blade carry it into linewith the die 7. In the front end of this die and exten ding inward for ashort distance is an opening 13 that is of substantially the samediameter ,as the oversize rod. The remaining length of the opening 14:through this die is of somewhat less diameter.

When the severed piece 'of rod carried by the cutter is in line with thedie 7 the punch 1 advances and forces the piece'into the die opening,causing a section'15 of the piece to be extruded, that is, reducedand'lengthened.

tion of oversize stock, and a punch and head- The outer end 16 of thispiece retains its origing and extruding die which will upset the outer'end and still further reduce a section of the stock and produce a capscrew blank.

I In the accompanying drawings Fig. 1 are sectional views illustratingthe treatment of the stock by the punches and dies of such a machineas'is mentioned.

Fig. 2 is a View looking toward the dies showing the transfer mechanismin elevation.

Fig. 3 shows a plan of the transfer mechanism applied to this machine.

Fig. 4 shows a detailed plan of the stock transfer slides.

. Fig. 5 is a vertical section on the plane indicated by the .dottedline 55 on Fig. 3.

Fig. 6 is a front elevation of the transfer fingers and verticallymovable slide to which they are attached.

The punches 1 and 2 are arranged in the same horizontal plane in a punchholder 3 that is reciprocated by any common header ram reciprocatingmechanism, the actuating means not being illustrated as they are wellknown to those skilled in this art. In a die block 4 in the end of theframe 5, and in the same horizontal plane as the punches, are

a feed quill 6, an extruding die 7, and an ex truding and heading die 8.

A rod of stock- 9 that is larger in diameter, 10 than will be the bodyof the finished blank, is

inal diameter. When the. piece has started into this die the cutter isreturned so as not to obstruct the punclr and to be in position i tosever the section of stock next fed through the quill. This punchhas arecess 17 which receives the outer end of the piece and all of the pieceis not forced into this die.

During the withdrawal of the punch 1 the piece is pushed out of theextruding die 7 by the pin 18, Fig. 5, which is actuated by theknock-out mechanism commonly employed in this type of machines.

As the piece is pushed out of the extruding die 7 spring fingers 19descend, grasp it and carry it sidewise into line with the die 8. Thesefingers are fixed to a slide 20 that is movable vertically in a way inthe front face of a bracket 21 which is fastened on a slide 22 that ismovable horizontally in a way ina frame 23. This frame is hinged to abracket.

24.- fastened to the top of the machine frame.

Extending from the back of the vertical slide 20 are ears 25 andconnected with these cars is an arm 26 that is splined upon a shaft 27so as to be rotated by the shaft but have a movement longitudinally ofthe shaft. This shaft is supported by bearings in the frame 23 and atone end it. has a rocker arm 28 to which a rod 29 is connected. This rodis reciprocated by any suitable and convenient means so that at thepropertimes the fingers are carried up and down.

The end of the slide 22 has a roll 30 that is engaged by an end of anangle lever 31 which by any suitable and convenient means is 0s cillatedat the proper times for moving this slide horizontally and carrying thefingers back and forth between the axes of the dies 7 and 8.

The piece ejected from the die 7 and which has a section 32 that isstill oversize and a section 33, Fig. 1, that is somewhat reduced butnot reduced to final size, is grasped by the fingers 19 and carried intoline with the die 8 and the punch 2 moves forward to force it into thisdie. The die 8 has for a short distance in its outer end an opening 34that is of substantially the size of the finished body of the blank tobe formed, and has an opening 35 of a diameter which will leave thatsection of the, blank of a size to permit the rolling of a threadthereon. In the end of the punch'2 is an opening 36 of a size and shapethat will form the head 37 of the blank from the end of the oversizesection 32 of the piece which is presented thereto.

The invention claimed is:

1. The combination with a heading machine which has two fixed solid diesand two reciprocatory punches, located in the same I horizontal plane,of a stock transfer mechanism which comprises a frame connected to themachine bed adjacent to the dies, a slide movable horizontally on saidframe, means for reciprocating said slide, a bracket carriedhorizontally by said slide, a slide movable memes nism which comprises aframe connected to the top of the machine bed adjacent to the dies, aslide movable horizontall on said frame, means for reciprocating saldslide, a bracket carried horizontally by said slide, a slide movablevertically on said bracket, fingers attached to said vertically movableslide, a shaft mounted on the frame, means for rocking said shaft, and arocker arm projecting from said shaft into engagement with thevertically movable slide for reciprocating said slide, said arm beingcarried longitudinally of the shaft by the horizontal movement of saidslide.

4 JOHN E. PRAGNY.

1 vertically on said bracket, fingers attached to said verticallymovable slide, a shaft mounted on the frame, means for rocking saidshaft, and an arm rotatable with and movable longitudinally along saidshaft and connected with the vertically movable slide, whereby thefingers are given vertical and horizontal movements for transferringstock from between one punch and die into line with the other punch anddie.

2. The combination with a heading machine which has two fixed solid diesand two reciprocatory punches located in the same horizontal plane, of astock transfer mechanism which comprises a frame hinged to the top ofthe machine bed adjacent to the dies,

a slide movable horizontally on said frame, means for reciprocating saidslide, a bracket carried horizontally by said slide, a slide movablevertically on said bracket, fingers attached to said vertically movableslide, a shaft mounted on the frame, means for rocking said shaft, andanarm rotatable with and movable longitudinally along said shaft andconnected with the vertically movable slide.

3. The combination with a heading machine which has two fixed solid diesand two reciprocatory punches located in the same horizontal plane, of astock transfer mecha-

